加微信进交流群:xituxiaoshutong100

Python中开启进程运行shell与杀掉进程

Python基础 迷途小书童 0评论

环境

  • ubuntu 18.04 64bit
  • python 3.8

前言

在实际项目中,经常会有这样的需求:

  • 某个进程已经在后台运行了,现在想通过进程名来杀掉它
  • 通过代码的方式启动一个新的进程来运行特定的shell指令,在需要的时候再杀掉该进程

那本文就来解决这个问题

示例代码

进程已经在后台运行的情况

这里由于进程已经执行了,大部分情况下是不知道进程的ID号的,也就是pid,因此,很多时候是要通过进程名去过滤并得到pid

比如我在终端执行了命令,这是个长时间运行的进程

watch -n 1 nvidia-smi

然后,在python中就可以这样去杀掉它

import os, signal, subprocess

def process():
    # 由用户输入进程名
    name = input("Enter process Name: ")
    try:
        # 通过进程名来过滤ps ax的结果
        for line in os.popen("ps ax | grep " + name + " | grep -v grep"):
            print('line: {}'.format(line))
            fields = line.split()
            print('fields: {}'.format(fields))

            # 解析出pid
            pid = fields[0]
            print('pid: {}'.format(pid))

            # 以发送信号的形式杀掉进程
            os.kill(int(pid), signal.SIGKILL)
        print("Process Successfully terminated")

    except:
        print("Error Encountered while running script")

if __name__ == '__main__':
    process()

执行上述代码

(base) xugaoxiang@1070Ti:~/PycharmProjects/pythonProject$ python test.py
Enter process Name: nvidia-smi
line: 16834 pts/1    S+     0:11 watch -n 1 nvidia-smi

fields: ['16834', 'pts/1', 'S+', '0:11', 'watch', '-n', '1', 'nvidia-smi']
pid: 16834
Process Successfully terminated

在python中启动进程

这里以开启进程,运行ping -W baidu.com为例

import os, signal, subprocess, time

def start_process_by_cmd(cmd):
    process = subprocess.Popen(cmd, shell=True)
    return process.pid

def kill_process_by_pid(pid):
    os.kill(pid, signal.SIGKILL)

if __name__ == '__main__':
    pid = start_process_by_cmd('ping -W 60 baidu.com')
    print('pid: {}'.format(pid))
    time.sleep(5)
    kill_process_by_pid(pid)

执行代码可以得到输出

pid: 5066
PING baidu.com (39.156.69.79) 56(84) bytes of data.
64 bytes from 39.156.69.79 (39.156.69.79): icmp_seq=1 ttl=44 time=29.4 ms
64 bytes from 39.156.69.79 (39.156.69.79): icmp_seq=2 ttl=44 time=29.3 ms
64 bytes from 39.156.69.79 (39.156.69.79): icmp_seq=3 ttl=44 time=29.8 ms
64 bytes from 39.156.69.79 (39.156.69.79): icmp_seq=4 ttl=44 time=29.9 ms
64 bytes from 39.156.69.79 (39.156.69.79): icmp_seq=5 ttl=44 time=29.4 ms
喜欢 (0)
发表我的评论
取消评论

表情